Means for closing the charging openings of furnaces



Feb. 24,1925. 1,527,957

- E. MUNKER MEANS FOR CLOSING- THE CHARGING OPENINGS 0F FURNACES Filed July 18, 1924 I Inven ior: "fmjj Min/fir Patented Feb. 24, 1925.

UNITED STATES PATENTIOFFICE- EMIL MITNKER, or EISLEBEN, GER-MANY, ASSIGNOR TO MYSELF AND MANSFIELD AKTIENGESELLSCHAFTFITR BERGBAU UNI) HTITTENBETRIEB, or EISLEBEN, GER- MANY, .A CORPORATION OF GERMANY.

MEANS FOR CLOSING THE CHARGING ornumes or summons.

Application flled J'uly 18,

To all whom it may concern.-

Be it known that I, EMIL MiiNKER, a citizen of the German Republic; residing at Eisleben, Germany, have. invented certain new and useful Improvements in Means for Closing the Chargingv Openings of F urnaces, of which the following is a specification.

My invention relates to improvements in means for closing the charging openings of furnaces and more particularly of industrial furnaces which are charged from the side through openings controlled by vertically disposed doors. In such furnaces the workmen are frequently molested by the dusty and obnoxious smoke gases formed during the process of manufacture and penetrating through the door. This is particularly the case when a certain gas pressure is maintained within the furnace with the object of utilizing the gases. In such cases it is practically impossible to keep the doors tight along all the foursides even if the greatest precautions are taken and to prevent the gases under pressure from escaping at the joints between the door and the wall of the furnace.

The object of my invention is to render the gases issuing at the joints between the door and the charging opening harmless by leading them out of the room surrounding the furnace.

With this object in view I mount upon the front of the furnace door and spaced therefrom a sheet-iron wall and connect the compartment thus formed between this spaced wall and the door with a suitable suction device. If the furnace stands under gas pressure the gases issuing at the joints of the charge door are considerably reduced in pressure and are in consequence of the partial vacuum generated in the compartment in front of the door drawn off and discharged into the atmosphere or into a settling chamber. In order to increase the effect aimed at a plurality of such walls 192' Serial No. 726,880;

from known protective devices employed in zinc furnaces and other lndustrlal furnaces. I/Vhlle 1n the known means the entlre furnace gases are sucked off and mixed with the air. entering. through the working opening discharged into the stock and by it into the open air without being utilized, the gases remain in my improved device free from air because their pressure is higher than that of the ambient air, and may thus be employed for burning purposes and the generation of power. Only the very small quantities of gas penetrating through'the door joints are led away and rendered harmless.

. In the drawings afiixed to this specification and forming part thereof embodiments of my invention are shown by way of example. In the drawings is Fig. '1, a vertical section through the im proved charging door on a furnace provided with a water jacket. A charging hopper is mounted in front of the improved door and its flap door is shown open in readiness for receiving the charge, while the charging door is closed,

Fig. 2, the same construction but with the charging door open and the hopper door closed at the moment when the charge is being introduced into the furnace and Fig. 3, a similar charging door but provided with two partition walls.

Similar parts are indicated by the same letters of reference in all the figures of the drawing.

Referring to the drawing a is the furnace which is closed towards the charging hopper 2) by a charging door owhich fits at all four sides as closely as possible. A good seal is desirable in order to increase on the one hand the suction and to reduce on the other hand the loss of gas to a minimum. In front of this door is fixed a sheet of iron 6! which forms with the door a compartment open at the top and at the bottom. The hopper 6 is closa-ble at the top by a door 9 and adjacent to the wall of the furnace is furnished with an extension 6 into which the compartment opens and into which the entire door is adapted to move up. The gases are withdrawn from this extension 6 by the pipe f leading to the stack or other means for producing a draught. The partition wall d fits the wall of the furnace as closely as possible at the bottom and the sides, for the reasons stated above, while it leaves the opening at the top free for the withdrawal of the gas which has escaped through the joints of the door.

The construction illustrated in Fig. 3 is in its essential features similar to the one shown in Fig. l. The only difference-is that n this case two partition walls d, (Z and consequently two compartments are provided in front of the charging door. The gases which should escape from the compartment next to the door are caught in the second compartment which also opens into the suction shaft 0. It is, of course, possible to arrange further partitions and chambers although two have been found ample.

The'invcntion may naturally be applied to furnaces of all kinds in which the escapeof obnoxious gases through the charge doors :annot be avoided, such as shaft furnaces, reverberatory furnaces and the like.

It will be readily understood that I donot limit myself to the details of construction or the proportions illustrated by way of eX- ample and that these may be modified with- V out departing from the spirit of my invention.

lVhat I claim as'my invention and desire to secure by Letters Patent is 1. Means for closing the charging hopper towards the furnace in industrial furnaces comprising in combination, a slidable door,

a sheet metal wall in front of said door and forming with said door a' compartment open at thebottom and at the top, a gas collecting chamber above said door and in communication with said compartment and a pipe for connecting said collecting chamber with means for producing a draught.

2. Means for closing-the charging hopper towards the furnace in industrial furnaces comprising in combination, a slidable door, a plurality of metal walls in front of said door and formingwit-h said door a plurality of compartments, a. gas collecting chamber above said door and 111 communication with said compartments'and a pipe for connecting said collecting chamber with means for producing a draught.

3. Means for closingthe charging opening of furnaces, comprising in combination, a closable hopper in front of the charging opening, an upward extension on said hopper, a suction pipe in communication with said extension, a slidable door adapted to close and open said chargingopeningand a wall upon the front of said door and forming a compartment in communication with said extension on said hopper.

In testimony whereof I have afiixed my signature in presence of two witnesses.

EMIL MilNKER.

Witnesses RUDOLPH FRICKE, MARTIN STInR. 

